Sparking-advance control device for explosion engines



April '6 1926.

M. D UTEN SPARKING ADVANCE CONTROL DEVICE FOR EXPLOSION ENGINES Filed Nov. 8. 1924 INTENT)? /%?Iz rz'cezzz 6 1 Patented Apr. 6 1926.

UNITED STATES MAURICE DUIEN, OF LEVALLOIS-PERRET, FRANCE.

SPARRING-ADVANCE CONTROL DEVICE FOR EXPLOSION ENGINES.

Application filed November 8, 1924. Serial No. 748,797.

To all whom it may concern:

Be it known that I, MAURICE DUTEN, a citizen of the Republic of France, residing at Levallois-Perrct', Seine, France, have invented new and useful Improvements in Sparking-AdvanceControl Devices for Explosion Engines, of which the following is a specification.

The object of my invention is to provide a device calculated automatically to control the sparking advance in explosion engines and adapted to be used with any type of magneto whatever the direction of the lat ters drive (clockwise or anti-clockwise revolving magneto).

In order to make my invention more clearly understood I have illustrated, as an example, an embodiment thereof in and by drawings appended hereto and wherein:

Figure 1 is a cross-sectional view of a device constructed according to my invention.

Figure 2 is a. front view of the crank-case and of the parts contained therein.

Figure 3 shows, as seen from inside the crank-case, a fore view of the plate closing the latter on the side of the magneto driving shaft.

In all the figures the same reference letters and numerals denote the same parts.

The device that is the object of my invention comprises a crank-case 1 fitted with a cover 2 which is secured on the axis of the armature of the magneto to be driven and which is provided with guides? and 4:, the latter maintaining between them two blocks 5 and 6 adapted to slide therealong.

7 denotes the end of the magneto-driving .shaft, the latter being driven from the engine in the ordinary way through a suitable reducing gear. l

Said shaft is ended by a plate 8, shaped as shown by Figure 8, andcarrying three spindles of suitable length 9, 10 and 11.

Spindle 9, set in the axis of shaft 7, engages between the two blocks 5 and 6 which, due to the special form imparted to them (see Figure 2), leave between them a clearance even when brought closest to one an other; the end of thesaid spindle 9 engages, as can be seen, into an aperture 9' provided for this purpose in cover 2.

Outcentered spindles 10 and 11 engage into slots 12 and 13, suitably slanting and of appropriate length, provided in blocks 5 and 6.

A plate 14, set on shaft 7, closes the crankshaped to allow plate 8 and shaft 7 to ro-.

tate a short angular distance respecting the crank-case.

Springs 16 and 17 influencing the blocks tend to force the latter towards the axis AB of the whole device.

Shaft 7, driven from the engine, drives, through spindles 10 and 11, blocks 5 and 6, guides 3 and 4, cover 2 and the whole of the crank-case thus causing the armature axis to be rotated.

On the velocity of rotation increasing, blocks 5 and 6 compressing their springs under the action of centrifugal force move away from axis AB and slots 12 and 13 are so set that, supposing shaft 7 is kept fixed, said parting of the blocks will cause a slight rotation of the crank-case and consequently of the armature in the direction in which the magneto is to revolve.

Therefore, shaft 7 rotating always in the same direction and crank-case 1 being dragged therewith, the moving apart of the blocks will result in a shifting of the crankcase and consequently of the armature in the direction of rotation of the whole, which will mean advanced ignition.

Said shifting depending on the distance by which the blocks get apart and therefore on the engines speed, it becomes apparent that I obtain an automatic sparking advance varying according to such speed.

Inversely, when speed decreases the blocks return closer to the axis AB by the action of springs 16 and 17, and a reversed shifting takes place, causing retarded ignition.

In the example shown I have supposed that it was a case of controlling a magneto driven anti-clockwise; in the case of a magneto driven clockwise, I would but have to as an example and that I reserve the right of introducing any constructional modifications without being deemed to depart from the scope of my invention.

The length and slant of the slots depend on the maximum advance desired to be obtained (30 as a rule).

The antagonistic springs serving to return the blocks closer to one another might, if convenient, be omitted such closing up tending to take place of itself under the driving action of shaft 7 Having now particularly ascertained and described the nature of my said invention as well as the manner in which the same is to be performed, I declare that what I claim is:

A timing device for advancing and retarding the drive between an internal combustion engine and sparking mechanism therefor in accordance with the speed of the engine, comprising a driving shaft and a driven shaft in opposed relation with each other, centrifugal weights arranged to the sides of the axis of said shafts, guide members on one of said shafts for said weights for guiding them radially outward and affording a driving connection between the weights and said shaft, and a driving connection between the weights and the other of said shafts comprising angnlarly 7 arranged slots in the weights extending outward away from the axis of the shafts, and pins projecting from the other of said shafts through said slots in the weights whereby the projection on the shaft will tend to hold the weights inward toward the axis of the shafts against the centrifugal force tending to throw the weights outward to advance the driven shaft with respect to the driving shaft.

In testimony whereof I have signed my name to this specification.

MAURICE DUTEN. 

